غنجة doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• غُنْجَةُ

  غُنْجَةُ ذ , (O,) or غُنَجَةُ, (TA,) without اَلْ, and imperfectly decl., (O, TA,) The قُنْفُذ [or hedge-hog], (O,) or the قُنْفُذَة [or female hedgehog]. (TA.)…

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• غَنِجَةٌ

  غَنِجَةٌ ذ (Bkh, S, A, MA, O, K) and (A, MA) and [in an intensive sense] , (O, K) applied to a girl, or young woman, (S, K,) or to a woman, (A, MA,) Using or who uses, amorous gesture or behaviour, &c., such as is termed…

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